如图,
,
的平分线交
的平分线于点E,交
于点F,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de29863745ee5013f270961735a31837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
23-24七年级上·河南鹤壁·期末 查看更多[5]
河南省鹤壁市浚县乡镇中学联考2023-2024学年七年级上学期1月期末数学试题(已下线)七年级下学期期中模拟03(人教版:相交线与平行线、实数、平面直角坐标系)-2023-2024学年七年级数学下学期期中考点大串讲(人教版)安徽省宿州市砀山县2023-2024学年七年级下学期期中数学试题安徽省铜陵市第四中学2023-2024学年七年级下学期期中数学试题(已下线)专题03+相交线与平行线1(含平行模型)(10大题型+优选提升题)-备战2023-2024学年七年级数学下学期期末真题分类汇编(北师大版)
更新时间:2024-01-25 16:47:17
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解答题-证明题
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【推荐1】如图,点B,F,C,E在同一条直线上,
,
,
.求证:
.
证明:∵
,
∴
(____________)
∵
,
∴______.
∴______.
在
与
中,
______
______
______
∴
(____________),
∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360ebefca282836247bdbb0d5018879c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0aa4c793921fdaa5d430cb90d78ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439fbb8974a5f907205d26b47b420bf4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/ba7027d0-93cf-49b8-9428-6604f9b3ae14.png?resizew=135)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0aa4c793921fdaa5d430cb90d78ca6.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e57a8c3317f09e35e901c11b7826c69.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360ebefca282836247bdbb0d5018879c.png)
∴______.
∴______.
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5447a70b9197de4d2814c227a33b42fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3322a2ad9a95bdc9fc576a7a158d4d.png)
______
______
______
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9357ae2dc09b981dd127197d1583d777.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439fbb8974a5f907205d26b47b420bf4.png)
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解答题-证明题
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【推荐2】如图,把矩形纸片
沿
折叠,使点
落在边
上的点
处,点A落在点
处,求证:
.
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【推荐3】平面内的两条直线有相交和平行两种位置关系.
(1)如图a,若AB∥CD,点P在AB、CD外部,则有∠B=∠BOD,又因∠BOD是△POD的外角,故∠BOD=∠BPD +∠D,得∠BPD=∠B-∠D.将点P移到AB、CD内部,如图b,以上结论是否成立?若成立,说明理由;若不成立,则∠BPD、∠B、∠D之间有何数量关系?请证明你的结论;
(2)在图b中,将直线AB绕点B逆时针方向旋转一定角度交直线CD于点Q,如图c,则∠BPD﹑∠B﹑∠D﹑∠BQD之间有何数量关系?(不需证明);
(1)如图a,若AB∥CD,点P在AB、CD外部,则有∠B=∠BOD,又因∠BOD是△POD的外角,故∠BOD=∠BPD +∠D,得∠BPD=∠B-∠D.将点P移到AB、CD内部,如图b,以上结论是否成立?若成立,说明理由;若不成立,则∠BPD、∠B、∠D之间有何数量关系?请证明你的结论;
(2)在图b中,将直线AB绕点B逆时针方向旋转一定角度交直线CD于点Q,如图c,则∠BPD﹑∠B﹑∠D﹑∠BQD之间有何数量关系?(不需证明);
![](https://img.xkw.com/dksih/QBM/2019/4/26/2190850844205056/2192359326474240/STEM/1c0f4008-417b-40cc-8bc2-44645fd2ae8f.png?resizew=542)
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【推荐1】如图,在方格纸中,点C在直线AB外.
(1)过点C画AB的垂线CE;
(2)过点C画AB的平行线CH;
(3)通过你的观察,CH与CE的位置关系为________.
(1)过点C画AB的垂线CE;
(2)过点C画AB的平行线CH;
(3)通过你的观察,CH与CE的位置关系为________.
![](https://img.xkw.com/dksih/QBM/2021/6/25/2750654789419008/2801426157772800/STEM/2279e038-ebbc-4204-b673-37cc31eacbd4.png?resizew=270)
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【推荐2】如图1,
,点P为直线
上方一点.
,
,则
度数为______;
(2)猜想
、
、
所满足的数量关系,并说明理由;
(3)如图2,
,若点P为直线
下方一点,此时
、
、
满足怎样的数量关系?如图3,
,若点P在直线
和直线
之间,此时
、
、
又满足怎样的数量关系?请你在图2和图3中任选一个直接写出你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
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(2)猜想
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(3)如图2,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bafaec1cbb31d644a0df6bbd4fe4f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bafaec1cbb31d644a0df6bbd4fe4f0.png)
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